I'm not going to tell you that this is the best heartbreak song I've ever heard, because it isn't. But there's a clear sense in which it stands at the furthest extremity of the genre.
He thinks he's found a way to live without her; and he even thinks he's found a way he can be happy. Doesn't sound much like heartbreak. But you listen and you'll see that it is - 'I Think I've Found A Way'.
[The series is introduced and indexed here.]